Formation and properties of cuprous oxide semiconductor colloids

T. Rajh, O. I. Mićić, A. J. Nozik

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Cuprous oxide colloids were obtained by radiolytic reduction of Cu2+ ions in alkaline solutions in the presence of 0.05%, poly(vinyl alcohol). Methylviologen cation radicals, Eu2+ ions, and the organic radicals (CH3)2COH and C02 inject electrons into colloidal Cu2O. These electrons are first captured relatively rapidly by a mid-gap state in Cu2O, and then they reduce Cu+ to Cu0 in a slower second step. The energy level of the mid-gap state was measured as a function of pH by equilibrating it with the MV2+/MV+ redox couple. The mid-gap state is insensitive to pH, indicating it does not involve protonic equilibrium. Photoexcitation of aqueous Cu2O sols in the presence of MV2+ results in reduction of Cu2O to Cu0, rather than electron transfer to MV2+ in the solution. This photoreductive corrosion can be suppressed in acetonitrile sols.

Original languageEnglish (US)
Pages (from-to)477-480
Number of pages4
Issue number4
StatePublished - Jul 1 1986
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry


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